Move Grayscale and X-ray presets
Move Grayscale and X-ray presets

Move Grayscale and X-ray presets so they are both in the middle of the list.

Signed-off-by: Brianna Major <6a62c0472e857db5994824f147beeb095c78d3a5@kitware.com>

OpenChemistry/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz,OpenChemistry/tomviz